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Kotatsu-neko was born in the 1800s as an ordinary stray cat, but when he tried to find warmth in the winter he was thrown out of every house he sneaked into and froze to death. Because of this he came back as a vengeful spirit with a love for kotatsu. He is often seen in Ataru's room or sitting with Cherry in front of his tent. He gets along well with Cherry and Ten, but he seems to be closest to the Tomobiki High School Principal, whom he is often seen drinking tea with. Kotatsu-neko is also super strong and has bested even Ryuunosuke and Benten with his mighty palm strike. The only characters to ever best him have been the Haunted Kotatsu and Oyuki.

Although Kotatsu-neko becoming a ghost cat for many years, it did not behave evil against its own companion like stary cats. But when Kotatsu-neko saw kotatsus that placed at many places, it will tried to occupy the owner of kotatsu by force.

Kotatsu-neko appears to be a enormous cat that is around 10 times bigger than normal cats, its whole body covered with white fur and some black big spots at left ear, back of lower body and right leg. Apart from that, Kotatsu-neko has a big eyes with small pupils, tiny black nose and some short whiskers at its face. Although Kotatsu-neko gets some razor claws, most of the time it always keep them in its paws.

Ten - Kotatsu-neko had set up a best friendship with Ten, whereby Ten invited it to visit Ataru's home for getting some warmth during its first appearance. Besides, Kotatsu-neko always obeyed what did Ten said.